Yamaha Wolverine YX70EPNG Service Manual page 420

Fault code No.
Item
2 Defective intake air pressure
sensor.
Fault code No. 15
TIP
If fault code numbers "15" and "16" are both indicated, take the actions specified for fault code number
"15" first.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Indicated
Procedure
Probable cause of malfunc-
Item
tion and check
1 Connection of throttle position
sensor coupler.
Check the locking condition of
the coupler.
Disconnect the coupler and
check the pins (bent or broken
terminals and locking condition
of the pins).
14
Intake air pressure sensor: hose system malfunction (clogged or de-
tached hose).
Execute the diagnostic mode.
(Code No. 03)
When engine is stopped:
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
At sea level: Approx. 101 kPa
(757.6 mmHg, 29.8 inHg)
1000 m (3300 ft) above sea lev-
el: Approx. 90 kPa (675.1
mmHg, 26.6 inHg)
2000 m (6700 ft) above sea lev-
el: Approx. 80 kPa (600.0
mmHg, 23.6 inHg)
3000 m (9800 ft) above sea lev-
el: Approx. 70 kPa (525.0
mmHg, 20.7 inHg)
When engine is cranking: Make
sure that the indication value
changes.
The value does not change
when engine is cranking. →
Check the intake air pressure
sensor.
Replace if defective.
Refer to "CHECKING THE IN-
TAKE AIR PRESSURE SEN-
SOR" on page 9-107.
15
Throttle position sensor: open or short circuit detected.
Able to start engine
Able to drive vehicle
01
Throttle position sensor signal
• 14–20 (fully closed position)
Check with throttle valve fully closed.
Maintenance job
Improperly connected → Con-
nect the coupler securely or re-
place the wire harness.
9-45
FUEL INJECTION SYSTEM
Confirmation of service com-
Turn the main switch to "
(on).
Fault code number is not dis-
played → Service is finished.
Fault code number is displayed
→ Go to item 2.
pletion
"